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MoS2/NiS core-shell structures for improved electrocatalytic process of hydrogen evolution
Journal of Power Sources ( IF 8.1 ) Pub Date : 2020-07-08 , DOI: 10.1016/j.jpowsour.2020.228497
Haishun Jiang , Kenan Zhang , Wenyao Li , Zhe Cui , Shu-Ang He , Siyu Zhao , Jun Li , Guanjie He , Paul R. Shearing , Dan J.L. Brett

It is important to develop a low-cost and easy-prepared electrocatalyst for hydrogen evolution reaction. In this work, MoS2/NiS hierarchical nanostructures (HHs) were fabricated on Ni foam by a simple one-step hydrothermal reaction using Ni foam as raw materials directly. Owing to the unique synthetic strategy that provide uniform MoS2/NiS HHs structure on the porous Ni foam, generate abundant active surfaces, small resistance, furthermore it is beneficial for carrier migration and contributing to a large number of active sites. Excellent electrocatalytic performances are obtained such as an overpotential of only ~84.1 mV to reach the current density of 10 mA cm−2, a Tafel slope of 76.9 mV dec−1 and a small inherent resistance of 6.33 Ω. More importantly, a quick current response under multistep potentials is realized and an excellent stability retained after 3000 cycles of CV test. Besides, a DC power to supply a device (MnMoO4//MoS2/NiS HHs B) under 1.6 V can generate a current density of 21 mA cm−2, demonstrating its practical application.



中文翻译:

MoS 2 / NiS核-壳结构用于改善氢析出的电催化过程

开发用于氢释放反应的低成本且易于制备的电催化剂是重要的。在这项工作中,通过直接使用镍泡沫为原料的简单一步水热反应,在镍泡沫上制备了MoS 2 / NiS分层纳米结构(HHs)。由于独特的合成策略,可以在多孔镍泡沫上提供均匀的MoS 2 / NiS HHs结构,产生丰富的活性表面,电阻较小,此外,它对载流子迁移有利,并有助于形成大量活性位点。获得了出色的电催化性能,例如仅约〜84.1 mV的超电势即可达到10 mA cm -2的电流密度,Tafel斜率为76.9 mV dec -1固有电阻为6.33Ω。更重要的是,在多步电势下实现了快速的电流响应,并且在3000次CV测试后仍保持了出色的稳定性。另外,在1.6V下向器件(MnMoO 4 // MoS 2 / NiS HHs B)供电的直流电源可以产生21mA cm -2的电流密度,证明了其实际应用。

更新日期:2020-07-08
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